• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Sulphuric Acid, Nitrogen-free
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Sulphuric Acid, Nitrogen-free

Nitrogen-free sulphuric acid of commerce containing about 96% w/w of H2SO4.

Complies with the following test.

Nitrates To 5  ml of water add carefully 45  ml of the reagent being examined, allow to cool to 40° and add 8  mg of N,N′-diphenylbenzidine. The solution is faint pink or very pale blue.